One concern is that Covid treatments work better (or maybe only work at all?) if they are started early.
I've read that the home tests have a higher "false negative" rate than the "molecular" test you would get at a lab. If you're really concerned, you might check
the CDC's locator to see if there's a free location near you for those higher-quality tests. (And I don't know how to decide if you should be "really concerned" -- this issue has obviously evolved since the days when we were devouring every bit of new info about it.)
If you're vaccined up, then your chances of getting through a bout with minimal symptoms are higher.
Then again at our age, we should be a bit careful.
Since a lot of public health services, including Covid services, are local, you could try calling your local 211 to see if some local office is offering up-to-date advice or help.
I haven't personally had good experiences with commercial-type walk-in/urgent-care clinics, but in a pinch that would be better than nothing. Also, if your DR knows that it's Covid related, might they see you more quickly?
^^
random spaghetti-at-the-wall ideas